function openvenster(url,popup_width,popup_height,scrollbars, center,popupname,leftpos,toppos) {
                var undefined;
                if (popup_width == undefined) popup_width=800;
                if (popup_height == undefined) popup_height=600;
                if (scrollbars == undefined) scrollbars='no';
				if (center == undefined) center = true;
                if (popupname == undefined) popupname='popup';
				if (center) {
	                left_pos = (screen.availWidth/2) - (popup_width / 2);
    	            top_pos = (screen.availHeight/2) - (popup_height / 2);
				} else {
					left_pos = top_pos = 0;
					if (leftpos != undefined) left_pos = leftpos;
					if (toppos != undefined) top_pos = toppos;
					
				}
                mywin = window.open(url,popupname,'height=' + popup_height + ',left=' + left_pos + ',top=' +top_pos + ',width=' + popup_width + ',status=no,maximize=1, resizable=yes, scrollbars=' + scrollbars);
                mywin.focus();
//                mywin.moveTo( 0, 0 );
// 				mywin.resizeTo( screen.availWidth, screen.availHeight );

            }

			function hires() {
				if ((screen.availWidth < 1000) && (screen.availHeight < 700)) {
					return false;
				} else {
					return true;
				}
			}

			function startwebsite(){
				if (hires()) {
					url = 'start.php';
				} else {
					url = 'start800.php';
				}
				openvenster(url,screen.width,screen.height-60,'yes',false,'websitewin',-3)
			}
			function startextranet(lang){
				openvenster('extranet.php?lng='+lang,790,545,'yes',null,'extranetwin')
			}
			function printpage(id, language) {
				openvenster('print.php?pid=' + id + '&lang='+ language,700,400,null,null,'printwin');
			}
			function doprint() {
			    if (!ismac()) {
			      window.print();
			      window.close();
			    } else {
			       alert('Klik op Archief, Print om deze pagina af te drukken.');
			    }
			}
			function ismac() {
			   if( navigator.platform.toString().toLowerCase().indexOf('mac')!=-1) {
			     return true;
			   } else {
			     return false;
			   }
			}
            function play(nr){
                var url="/player.php?song="+nr;
                var popup_w=257;
                var popup_h=140;
                var popup_left=0;
				height = window.innerheight;
                var popup_top=0;

                openvenster(url, popup_w, popup_h,false,true,'mp3player');
            }

			function rowonover(row) {
				row.className+=' over';
			}
			function rowonout(row) {
				row.className = row.className.replace(' over','');
			}